It comes out May 25th, the demo should be out around April 22nd.
This is the second game in the series. UFC Undisputed 2009 was generally considered a big hit, but the hardcore Undisputed players noticed it lacked a bit in technical moves.
This year seems to be a general improvement all around, with more positions, more styles, cage work, new submission system, and a lot more.
What fighters are you hoping to see? Or if you don't know/care about the fighters, what are you looking forward to in the game?